Electronic Management; Mpem (Multi-Purpose Electronic Module) - Sea-doo RX Shop Manual

Section 05 ENGINE MANAGEMENT (DI)
Subsection 02 (OVERVIEW)

ELECTRONIC MANAGEMENT

MPEM (multi-purpose electronic
module)
The electronic fuel injection is equipped with a
MPEM. It is also called ECU (Electronic Control
Unit). It is the brain of the electrical system/fuel
injection system.
1. Multi-Purpose Electronic Module (MPEM)
The MPEM is mounted in the front of the water-
craft.
The MPEM is directly powered by the battery. It is
responsible for the following engine management/
electrical functions:
05-02-4
– interpreting information
– distributing information
– start/stop function
– timer
– DESS (Digitally Encoded Security System)
– ignition timing maps
– injection maps (fuel injector and direct injector)
– MPEM contains a total of 34 maps (injection
and ignition) for optimum engine operation in all
conditions
– engine RPM limiter
– etc.
The MPEM features a permanent memory that
will keep the programmed safety lanyard(s) active,
fault codes and other vehicle information, even
when the battery is removed from the watercraft.
MPEM — General Functions
Automatic Power Shut-Down
The MPEM is equipped with an automatic power
shut-down. This feature prevents the battery from
losing its charge if the safety lanyard cap is left on
the post when the engine is not running.
After connecting the safety lanyard cap, the
MPEM will remain in standby mode during the
next 10 minutes, waiting for a starting. If the start/
stop button is not depressed, then the MPEM will
be automatically powered down.
Antistart Feature
This system allows starting the vehicle only with
safety lanyard(s) that has been programmed to op-
erate a specific watercraft. This functionality is the
DESS system. See below for details.
Digitally Encoded Security System (DESS)
The following components are specially designed
for this system: Multi-Purpose Electronic Module
(MPEM), safety lanyard cap and safety lanyard
post.
The safety lanyard cap contains a magnet and a
ROM chip. The magnet actually closes the reed
switch inside the post which is the equivalent of a
mechanical ON/OFF switch. The chip has a unique
digital code.
The DESS circuitry in the watercraft MPEM is ac-
tivated at the factory. Therefore, a safety lanyard
must be programmed to start the engine.
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SMR2000-050-05-02A.FM